Hand-drill



(Modem WfBURKHOLDER.

Hand' Drill.

No. 234,109. Patented Nov. 2, 1880.

UNITED STATES PATENT OFFICE.

JOHN W. BURKHOLDER, OF MOLINE, ILLINOIS.

HAND- DRILL.

SPECIFICATION forming part of Letters Patent No. 234,109, dated November2, 1880.

Application filed May 14, 1880.

To all whom it may concern:

Be it known that 1, JOHN W. BURKHOLDER,

of Moline, county of Rock Island, and State of Illinois, have inventedcertain Improvements in Hand Drills and Chucks, of which the followingis a specification.

My invention relates to an improvement in hand drilling-machines; and itconsistsin the construction and arrangement of parts whereby the drillis held while in use, as will be more fully described hereinafter.

Figure 1 is a side elevation of a drill complete. Fig. 2 is a verticalsection of the chuck. Fig. 3 is an edge view of a portion of the drill.

A represents the drill-stock B, the drivingwheel O, the pinion, whichmeshes with the wheel B and operates the drill, and D the chuck.

The wheel B is operated by the slotted ad:

justable crank or handle E, which is held in any desired position bymeans of the clamping-screw F. The stock A has a socket, i, made in itsupper end to receive a rest, and has an extension, h, formed on oneside, so as to form a longer and better bearing for the journal of thewheel B. The rod or shaft (1 passes up through the lower end of thestock, and has the pinion secured to its upper end. The lower end ofthis rod or shaft is considerably enlarged, as shown atf, and providedwith a screw-thread, so as to screw into the internally-threaded collar9, by which the jaws (ModeL) b are opened and closed. Through thisenlarged end f is made a slot, 6, to accommodate thejaws b and pin 0,which connects thejaws to the collar g. In or er that this collar g maybe turned freely around without affecting the pin 0 an enlargement, d,is formed on the lower end of the collar, and into this enlargement theends of the pin pass after they have passed through the upper ends ofthejaws b. The upper ends of the jaws are passed upward through theguides 0 at a suitable angle, which guides form a bearing, inside andout, for the jaws, and thus always hold them firmly and rigidly inplace. As the collar 9 is moved upward on the partfthe jaws are drawnupward through the guides, and the lower ends of the jaws are broughtnearer together; but when the sleeve or collar is moved downward on thepartfthe clamping ends of thejaws are opened outward.

Having thus described my invention, I claim In a drill, the combinationof the rod a, having the enlarged threaded partf, which has the slot 0made through its center, and the guides 0 at the end, and sleeve 9,having the enlarged grooved part d, the pin 0, and jaws b, substantiallyas shown.

JOHN W. BURKHOLDER.

Witnesses:

O. F. BARKER, E. B. MoKEEvER.

